docs: def celery_enable_all():
      """Enable johnny-cache in all celery tasks, clearing the local-store
      after each task."""
      from celery.signals import task_prerun, task_postrun, task_failure
      task_prerun.connect(prerun_handler)
      task_postrun.connect(postrun_handler)
      # Also have to cleanup on failure.
      task_failure.connect(postrun_handler)